Observation of the photonic Hall effect and photonic magnetoresistance in random lasers

Wenyu Du, Lei Hu, Jiangying Xia, Lin Zhang, Siqi Li, Yan Kuai, Zhigang Cao, Feng Xu, Yu Liu, Kaiming Zhou, Kang Xie, Benli Yu, Ernesto P. Raposo, Anderson S. L. Gomes and Zhijia Hu ()
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Wenyu Du: Anhui University
Lei Hu: Anhui University
Jiangying Xia: Anhui University
Lin Zhang: Aston University
Siqi Li: Anhui University
Yan Kuai: Anhui University
Zhigang Cao: Anhui University
Feng Xu: Anhui University
Yu Liu: Anhui University
Kaiming Zhou: Aston University
Kang Xie: Zaozhuang University
Benli Yu: Anhui University
Ernesto P. Raposo: Universidade Federal de Pernambuco
Anderson S. L. Gomes: Universidade Federal de Pernambuco
Zhijia Hu: Anhui University

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Modulation of scattering in random lasers (RLs) by magnetic fields has attracted much attention due to its rich physical insights. We fabricate magnetic gain polymer optical fiber to generate RLs. From macroscopic experimental phenomena, with the increase of the magnetic field strength, the magnetic transverse photocurrent exists in disordered multiple scattering of RLs and the emission intensity of RLs decreases, which is the experimental observation of photonic Hall effect (PHE) and photonic magnetoresistance (PMR) in RLs. At the microscopic level, based on the field dependence theory of magnetic disorder in scattered nanoparticles and the replica symmetry breaking theory, the magnetic-induced transverse diffusion of photons reduces the scattering disorder, and then decreases the intensity fluctuation disorder of RLs. Our work establishes a connection between the above two effects and RLs, visualizes the influence of magnetic field on RL scattering at the microscopic level, which is crucial for the design of RLs.

Date: 2024
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DOI: 10.1038/s41467-024-48942-6

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